volume of gas produced by a reaction

Question 1

What does both practicals show us

Answer 1

Both of these experiments show us that the greater the concentration of a chemical in a reaction, the faster the reaction takes place.

Question 1

people have different eyesight for some people the corss might be gone while for others it still may be visible

all students will use the same sized cross

Answer 1

1. Use a measuring cylinder to place 50 cm3 of hydrochloric acid into a conical flask.
2. Attach the conical flask to a bung and delivery tube.
3. Now place the delivery tube into a container filled with water.
4. Then place an upturned measuring cylinder also filled with water over the delivery tube.
5. Add a 3 cm strip of magnesium to the hydrochloric acid and start a stopwatch.
6. The reaction produces hydrogen gas which is trapped in the measuring cylinder.
7. Every ten seconds, measure the volume of hydrogen gas in the measuring cylinder.
8. Continue till no more hydrogen gas is given off
9. repeat the experiment with different levels of hydrocloric acid